Root cause: Jira rejects Task-under-Task nesting ("Please select valid
parent issue"). Campaign tickets and test tickets were both created as
Task, so nesting test under campaign failed for all 62 APT32 tests.
Fix:
- JIRA_ISSUE_TYPE_CAMPAIGN: "Epic" -> "Task" (was unused, now used)
- JIRA_ISSUE_TYPE_SUBTASK: "Sub-task" (new config key)
- auto_create_campaign_issue: uses JIRA_ISSUE_TYPE_CAMPAIGN (Task)
- auto_create_test_issue: uses Sub-task when parent_ticket_override is
set (campaign context), Task otherwise (standalone)
Hierarchy: OFS-9107 -> Campaign (Task) -> Test (Sub-task)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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